【求助】帮忙解答几道题，谢谢啦~

fengchen318

9. Astronomers at the Palomar Observatory have discovered a distant supernova explosion, one that they believe is a type previously unknown to science.
(A) that they believe is
(B) that they believe it to be
(C) they believe that it is of
(D) they believe that is
(E) they believe to be of

答案是E，我选A。。。求解。。。

11. Based on accounts of various ancient writers, scholars have painted a sketchy picture of the activities of an all-female cult that, perhaps as early as the sixth century B.C., worshipped a goddess known in Latin as Bona Dea, “the good goddess.”
(A) Based on accounts of various ancient writers
(B) Basing it on various ancient writers’ accounts
(C) With accounts of various ancient writers used for a basis
(D) By the accounts of various ancient writers they used
(E) Using accounts of various ancient writers
 答案是E，我还选A。。。为什么。。。
. Unlike computer skills or other technical skills, there is a disinclination on the part of many people to recognize the degree to which their analytical skills are weak.
(A) Unlike computer skills or other technical skills, there is a disinclination on the part of many people to recognize the degree to which their analytical skills are weak.
(B) Unlike computer skills or other technical skills, which they admit they lack, many people are disinclined to recognize that their analytical skills are weak.
(C) Unlike computer skills or other technical skills, analytical skills bring out a disinclination in many people to recognize that they are weak to a degree.
(D) Many people, willing to admit that they lack computer skills or other technical skills, are disinclined to recognize that their analytical skills are weak.
(E) Many people have a disinclination to recognize the weakness of their analytical skills while willing to admit their lack of computer skills or other technical skills.
 请问C选项为什么不对呢？ 答案是D。。。太诡异了
谢谢各位了~~

毛毛carina

第一题：http://forum.chasedream.com/GMAT_SC/thread-327874-1-8.html  讨论帖

第二题：句子主语scholars是人，所以A项的based不对，应该是basing

第三题：C选项的they指代模糊，有可能是analytical skills，也可能是people
 
             D选项对的理由，看这个讨论帖：http://forum.chasedream.com/GMAT_SC/thread-106239-1-1.html